Method for selecting impedance setting for loop start trunk...

Details Method for selecting impedance setting for loop start trunk... Method for selecting impedance setting for loop start trunk...

2006-12-07

2010-06-15

Kuntz, Curtis (Department: 2614)

Telephonic communications

Line equalization or impedance matching

C379S345000, C333S017300, C333S032000, C333S124000, C333S100000, C333S135000

Reexamination Certificate

active

07738653

ABSTRACT:
A method of selecting an optimum impedance for a loop start trunk line, comprising successively applying respective ones of a plurality of impedance settings to the loop start trunk line, for each impedance setting measuring the impulse response of the trans-hybrid echo path by applying audio test signals to obtain a time-domain trans-hybrid transfer function and deriving a frequency-domain spectrum representative of trans-hybrid loss, and then calculating figure of merit of the transfer function based on the power spectrum. Once all impedance settings have been tested, the optimum impedance is selected as the impedance setting associated with the highest calculated figure of merit.

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M. Peard; ECHO Return Loss Compensation by Switched Filters; May 1977; pp. 4640-4641; IBM Technical Disclosure Bulletin.

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